Tread portion of an automobile tire



FIG. 1 is a front view of a tread portion of an automobile tire;

FIG. 2 is a perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a fragmentary enlarged view showing the details of the tread portion thereof;

FIG. 6 is an end view taken along line A—A in FIG. 5; and,

FIG. 7 is an end view taken along line B—B in FIG. 5.

Broken lines in the drawing figures are intended to show environmental structure only, and form no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 